Update criterion requirement from 0.3.4 to 0.4.0

Updates the requirements on [criterion](https://github.com/bheisler/criterion.rs) to permit the latest version.
- [Release notes](https://github.com/bheisler/criterion.rs/releases)
- [Changelog](https://github.com/bheisler/criterion.rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bheisler/criterion.rs/compare/0.3.4...0.4.0)

---
updated-dependencies:
- dependency-name: criterion
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -61,7 +61,7 @@ optional = true
 version = "0.22"
 
 [dev-dependencies]
-criterion = "0.3.4"
+criterion = "0.4.0"
 env_logger = "0.9.0"
 input_buffer = "0.5.0"
 net2 = "0.2.37"